UL497L-S16-R datasheet(3/8 Pages) UTC

3 / 8 page

UL497

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

3 of 8

www.unisonic.com.tw

QW-R118-015.a

PIN DESCRIPTION (Cont.)

PIN NO.

PIN NAME

DESCRIPTION

DWELL CONTROL

The average voltage on the capacitor CW connected between this pin and

ground depends on the motor speed and the voltage supply. The comparison

between V CW and V CT voltage determines the timing for the dwell control.

BIAS CURRENT

The internal current which used to drive the external capacitors of the dwell

control(pin10 and11)permanent conduction protection (pin 9) and slow

recovery time (pin 8) can be set by a resistor(recommended 62KΩ)

connected between this pin and ground.

CURRENT SENSING

Connection for the Coil Current Limitation.

The current limitation value is given by :

Isens=0.32×(R10+R11)÷(RS×R11)

RS: sensing resistor

DRIVER EMITTER

OUTPUT

Current Driver for the External Darlington.

OVER VOLTAGE LIMIT

The internal divider R3/R2 defines the limitation value given by:

VOVP=(22.5/R3+5×10

-3)×R2+22.5

DRIVER COLLECTOR

INPUT

Through this pin The collector current of the internal driver which drives the

external limits darlington is supplied. Then the external resistor R6 the

maximum current supplied to the base of the external darlington.

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